UPDATE (12:15 p.m.): Tyler Lachmann attacked his mother and father "without provocation" on Sunday, according to an interim complaint obtained by KGUN 9,
The complaint said Lachmann's mother originally told deputies that she and her husband were attacked by two masked men.
Detectives determined that there was no indication of a robbery and that both the husband and wife had injuries to their faces, heads and arms consistent with an assault, the complaint said.
The wife eventually admitted that she made the story up to protect her son, the complaint said. She said Lachmann attacked she and her husband unprovoked, repeatedly punching her and slamming her head on the concrete, the complaint said.
She said Lachmann said that he did not want to come back "here." She said she believed her plea to him to stop was what made him eventually stop, but he didn't at first, the complaint said.
She said Lachmann went after her husband, as well, when the three of them were in the kitchen, the complaint said.
When the attack was over, she was able to help her husband to his bed. She took his shirt off, and changed his pants to sweatpants.
She monitored him through the night, the complaint said. In the morning she said he had stopped breathing and was cold to the touch.
911 was called and he was declared dead.
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A 39-year-old man was arrested on suspicion of violently assaulting his parents Sunday, resulting in his father's death.
According to a news release from Pima County Sheriff's Department, deputies arrived at a home in the 600 block of West Placita de la Poza at just before 12:30 p.m.
They were responding to reports of an unresponsive male, initially reported as a possible cardiac arrest, the news release said.
They arrived to find 73-year-old Chris Lachmann dead inside the home. His 72-year-old wife was also found in the house, the news release said, with significant injuries. She was transported to a local hospital for treatment.
Both victims had injuries consistent with a violent assault, the news release said.
Detectives determined the couple's son, Tyler Lachmann, was the suspect.
Lachmann was located in the 1550 block of West Grant Road and taken into custody.
Lachmann was charged with first-degree murder and domestic violence, vulnerable adult abuse.
