Christian Gerhartsreiter (right) reacted after being found guilty Wednesday in the killing of John Sohus in 1985.

Gerhartsreiter listened as a verdict was read inside the Los Angeles courtroom.

Ellen Sohus, sister of the murder victim, smiled during a news conference after the verdict.

Christian Karl Gerhartsreiter in Germany at age 17 before he left for the United States.

Gerhartsreiter lived in the same house as John Sohus (right) and his wife, Linda, who is also presumed dead.

Gerhartsreiter was known as Clark Rockefeller when he was charged with kidnapping his daughter off a Boston street in 2008.

After abducting his 7-year-old daughter, Gerhartsreiter took her to an apartment in Baltimore, where he was arrested.

Gerhartsreiter, with his attorney in the Boston kidnapping case, was arraigned in Boston on Sept. 29,2008.

After his 2008 arrest on kidnapping charges, Gerhartsreiter was interviewed by the Globe at the Nashua Street Jail.

Gerhartsreiter was found guilty in his kidnapping trial in Suffolk Superior Court in Boston on June 12, 2009.

A TV movie about Gerhartsreiter, " Who is Clark Rockefeller?" starring Eric McCormack (left) aired on Lifetime in 2010.