SIOUX CITY, Iowa (AP) — A jury has found a 20-year-old Denison man guilty of killing two elderly people and trying to burn their bodies.

Jurors delivered the guilty verdict Tuesday to Jayden Chapman, convicting him of two counts of first-degree murder and reckless use of fire in the deaths of 80-year-old Marvin Huesling and 81-year-old Alice Huisenga.

Chapman testified Monday in his own defense, saying he shot Huisenga because another man, 27-year-old Michael Schenk, gave him the gun. Chapman said Schenk threatened to kill him if he didn’t shoot.

Authorities say Schenk and Chapman shot the pair in March 2014 at a trailer home in Deloit and then set it on fire. Schenk was sentenced in March to two life terms for his role in the slayings.