The malicious masked militant who has already beheaded two journalists has named his next victim — a former British soldier who had dedicated his life to peacekeeping in war-torn countries like South Sudan and Syria.

Following the format of the first video distributed by ISIS, “A Second Message To America” appears to show the same masked British killer brutally beheading journalist Steven Sotloff before introducing his next target: David Cawthorne Haines.

Haines was abducted early in 2013 in Syria, according to Tiffany Easthom, director of the Nonviolent Peaceforce in South Sudan, where he worked for six months in 2012.

Haines spent his time on Easthom’s team as a security operations manager for the civilian peacekeeping organization.

“He had decided to contribute to the humanitarian world from the civilian perspective,” Easthom said.

While she only knew Haines for a short time, Easthom said he successfully navigated the difficult working environment in South Sudan.

“He has a good sense of humor,” she added. “He just really cares about people.”

Haines left the organization in 2012 at the “natural end” of his contract and planned to pursue more short-term contract work. She said he was working for another organization, ACTED, at the time of his abduction.

Easthom said she did not watch the graphic video showing Sotloff’s death, but she did see a screenshot of Haines’ familiar face.

“He looks thinner,” she said. “I guess that’s not surprising, but it’s a pretty horrible thing.”

She added that while she faces threats in South Sudan, they are of a different breed than what humanitarians, civilians and reporters face in communities controlled by ISIS.

“This is a conflict that has taken on a whole new level of brutality that we haven’t seen before,” Easthom said.

“Let’s just hope there’s a positive outcome for David and everyone else who doesn’t have their freedom right now.”