MANCHESTER, Iowa --- Autopsy results show an elderly couple found dead in Manchester died of gunshot wounds, authorities revealed Wednesday.
The bodies of Richard Sweet, 55, and his wife, Janet, 62, were discovered in their home Sunday afternoon when relatives arrived for a Mother's Day gathering.
The couple's grandson, 17-year-old Isaiah Sweet, faces two counts of first-degree murder. He was charged as an adult.
Delaware County Attorney John Bernau declined to provide details, citing an ongoing investigation.
According to a criminal complaint, Isaiah Sweet called a female friend Friday evening claiming he had "drugged his grandparents and thought they were dead." He called again Saturday morning and said he had killed the couple, who were his legal guardians, according to the complaint.
"The cause of death was a shooting, not by poisoning," Bernau said.
Sweet was arrested Monday night in Cedar Rapids after a short chase by police. He remains in the Buchanan County Jail on $1 million bond.
Bernau said Sweet's attorney, Steven Hodge, requested his client be moved to the Dubuque County Jail to be closer to Hodge.
Though charged as an adult, Bernau said, Sweet must be housed "by sight and sound restrictions as a juvenile."
A witness in Cedar Rapids claims Isaiah Sweet had a hunting knife, marijuana and bottles of prescription pills when she saw him Saturday evening.
Kelli Fisher, 19, said Sweet drove her and some friends to a party about 10 p.m. It was the first time she had met Sweet, who she said was an ex-boyfriend of one of the other women.
"He was very nervous, visibly shaking," Fisher said.
"He was showing off because we were all older than him. He was driving fast and we were telling him to slow down," she added.
After the party, Fisher said they went to a convenience store that turned out to be closed. Sweet set off an alarm by trying to open the door.
Responding officers discovered his driver's license had been suspended and that he did not have permission to drive the truck he was using. The truck belonged to Sweet's grandfather.
Sweet was taken to the Iowa City Police Department. He told officers they would not be able to reach his grandparents because they were traveling.
Fisher said Sweet mentioned his grandparents once that night.
According to Fisher, Sweet said he hadn't graduated from high school because his grandmother was always in the hospital being treated for leukemia.
"He seemed angry about it," she said.