Park Record Media Center

This image made from video posted on the Internet by Islamic State militants and provided by the SITE Intelligence Group, a U.S. terrorism watchdog, on Tuesday, Sept. 2, 2014, purports to show journalist Steven Sotloff before he was beheaded. Sotloff had last been seen in Syria in August 2013 until he appeared in a video released online by the Islamic State group on Aug. 19, 2014, that showed the beheading of fellow American journalist James Foley. The Arabic text at the bottom of the frame translates to "Now is the time for my message." (AP Photo) ( Mideast Syria )

In this handout image made available by the photographer American journalist Steven Sotloff (Center with black helmet) talks to Libyan rebels on the Al Dafniya front line, 25 km west of Misrata on June 02, 2011 in Misrata, Libya. Sotloff was kidnapped in August 2013 near Aleppo, Syria and was recently shown on a jihadist video in which fellow US journalist James Foley was executed. In the video the militant form the Islamic State (IS) threatens to kill Sotloff next if the US continues its aerial campaign against the insurgency. (Photo by Etienne de Malglaive via Getty Images) ( File Photo Of US Journalist Steven Sotloff Held Hostage By Extremists )

In this image made from video obtained on Wednesday, Aug. 27, 2014, Shirley Sotloff, who lives in Florida, appeals to the captors of her son, freelance journalist Steven Sotloff, 31, who was last seen in Syria in August 2013. On a video released on Aug. 19, 2014, he was threatened with death by militants from the Islamic State unless the U.S. stopped air strikes on the group in Iraq. The same video showed the beheading of fellow American journalist James Foley. (AP Photo) ( Islamic State Hostage Journalist )

In this handout image made available by the photographer American journalist Steven Sotloff (Center with black helmet) talks to Libyan rebels on the Al Dafniya front line, 25 km west of Misrata on June 02, 2011 in Misrata, Libya. Sotloff was kidnapped in August 2013 near Aleppo, Syria and was recently shown on a jihadist video in which fellow US journalist James Foley was executed. In the video the militant form the Islamic State (IS) threatens to kill Sotloff next if the US continues its aerial campaign against the insurgency. (Photo by Etienne de Malglaive via Getty Images) ( File Photo Of US Journalist Steven Sotloff Held Hostage By Extremists )

A Pinecrest, Fla., police officer stands outside the home of the family of journalist Steven Sotloff, Tuesday, Sept. 2, 2014 in Pinecrest, Fla. An Internet video posted online Tuesday purported to show the beheading by the Islamic State group of Sotloff, who went missing in Syria last year. The extremist group, which has claimed wide swaths of territory across Syria and Iraq and declared itself a caliphate, said Sotloff's killing was retribution for continued U.S. airstrikes targeting its fighters in Iraq. (AP Photo/Wilfredo Lee) ( Mideast Syria Sotloff )

In this handout image made available by the photographer American journalist Steven Sotloff (Center with black helmet) talks to Libyan rebels on the Al Dafniya front line, 25 km west of Misrata on June 02, 2011 in Misrata, Libya. Sotloff was kidnapped in August 2013 near Aleppo, Syria and was recently shown on a jihadist video in which fellow US journalist James Foley was executed. In the video the militant form the Islamic State (IS) threatens to kill Sotloff next if the US continues its aerial campaign against the insurgency. (Photo by Etienne de Malglaive via Getty Images) ( File Photo Of US Journalist Steven Sotloff Held Hostage By Extremists )

An unidentified woman walks towards the home of the family of journalist Steven Sotloff, Tuesday, Sept. 2, 2014 in Pinecrest, Fla. An Internet video posted online Tuesday purported to show the beheading by the Islamic State group of Sotloff, who went missing in Syria last year. (AP Photo/Wilfredo Lee) ( Mideast Syria )

In this handout image made available by the photographer American journalist Steven Sotloff (Center with black helmet) talks to Libyan rebels on the Al Dafniya front line, 25 km west of Misrata on June 02, 2011 in Misrata, Libya. Sotloff was kidnapped in August 2013 near Aleppo, Syria and was recently shown on a jihadist video in which fellow US journalist James Foley was executed. In the video the militant form the Islamic State (IS) threatens to kill Sotloff next if the US continues its aerial campaign against the insurgency. (Photo by Etienne de Malglaive via Getty Images) ( File Photo Of US Journalist Steven Sotloff Held Hostage By Extremists )

An unidentified man waits to enter the home of the family of journalist Steven Sotloff, Tuesday, Sept. 2, 2014 in Pinecrest, Fla. An Internet video posted online Tuesday purported to show the beheading by the Islamic State group of Sotloff, who went missing in Syria last year. (AP Photo/Wilfredo Lee) ( Mideast Syria )

Television journalists stand across from the home of the family of journalist Steven Sotloff, Tuesday, Sept. 2, 2014 in Pinecrest, Fla. An Internet video posted online Tuesday purported to show the beheading by the Islamic State group of Sotloff, who went missing in Syria last year. In a two-sentence statement Tuesday, family spokesman Barak Barfi said Sotloff's family, quote, "knows of this horrific tragedy and is grieving privately." (AP Photo/Wilfredo Lee) ( Mideast Syria Sotloff )

White House press secretary Josh Earnest pauses while speaking about the militant group al-Shabab in Somalia, during his daily news briefing at the White House in Washington, Tuesday, Sept. 2, 2014. Earnest also spoke about reports that a video on the internet that purports to show beheading of US reporter Steven Sotloff by Islamic State group. (AP Photo/Jacquelyn Martin) ( Obama )

In this handout image made available by the photographer American journalist Steven Sotloff (Center with black helmet) talks to Libyan rebels on the Al Dafniya front line, 25 km west of Misrata on June 02, 2011 in Misrata, Libya. Sotloff was kidnapped in August 2013 near Aleppo, Syria and was recently shown on a jihadist video in which fellow US journalist James Foley was executed. In the video the militant form the Islamic State (IS) threatens to kill Sotloff next if the US continues its aerial campaign against the insurgency. (Photo by Etienne de Malglaive via Getty Images) ( File Photo Of US Journalist Steven Sotloff Held Hostage By Extremists )

U.S. President Barack Obama comments about U.S. journalist Steven Sotloff, killed by Islamic State militants, during a joint news conference with Estonian President Toomas Hendrik Ilves at the Bank of Estonia in Tallinn, Estonia, Wednesday, Sept. 3, 2014. Obama is in Estonia for a one day visit where he will meet with Baltic State leaders before heading to the NATO Summit in Wales. (AP Photo/Charles Dharapak) ( Obama Estonia )

In this handout image made available by the photographer American journalist Steven Sotloff (Center with black helmet) talks to Libyan rebels on the Al Dafniya front line, 25 km west of Misrata on June 02, 2011 in Misrata, Libya. Sotloff was kidnapped in August 2013 near Aleppo, Syria and was recently shown on a jihadist video in which fellow US journalist James Foley was executed. In the video the militant form the Islamic State (IS) threatens to kill Sotloff next if the US continues its aerial campaign against the insurgency. (Photo by Etienne de Malglaive via Getty Images) ( File Photo Of US Journalist Steven Sotloff Held Hostage By Extremists )