His parents were just the start.
A California teen who shot and killed his mom and dad as they slept in their multimillion-dollar mansion last month intended to kill every family member in the house, including his 8-year-old brother, prosecutors said.
Ashton Sachs, 19, was arrested Thursday after a month-long investigation into the deaths of Bradford Sachs, 57, and Andra Sachs, 54, who were found fatally shot in the bedroom of their ritzy home in San Juan Capistrano, a city between Los Angeles and San Diego.
During the attack, Sachs also opened fire on his 17-year-old sister and 8-year-old brother, missing the girl but hitting the little boy.
The boy is now paralyzed, authorities said.
On Monday, Orange County Prosecutor Ebrahim Baytieh said Sachs had planned the brutal attack for months.
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"This is a horrendous crime involving an adult man who decided to murder and kill the people who loved him the most, and the people who were supporting him."
Sachs was attending community college in Seattle at the time, and he drove nearly 1,200 miles through Washington state and California before sneaking into his family's $3.5 million mansion sometime after midnight on Feb. 9, investigators said.
Using a gun he bought on his own, he shot his parents as they slept and then opened fire on his adopted little brother, who was in his bedroom, prosecutor said.
He then fired at one of his two sisters who were home at the time, missing her, before fleeing the house.
Baytieh said he took a flight back to the Washington after the attack.
In the weeks after the slayings, Sachs and his siblings were interviewed by police, but investigators found few clues that suggested the second-oldest son was the triggerman.
After a month-long investigation, police tracked the teen down in the San Diego area, where he and his older brother, Myles, had applied for guardianship of their two younger siblings, the Orange County Register reported.
Investigators said they spoke with Sachs "at length" during the subsequent questioning and arrest, but have not revealed what he told them.
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The investigation into their deaths was complicated at first because they apparently had "a long list of people" that did not like them, Orange County sheriff's investigator Justin Montano told the Register last week.
On Monday, Baytieh said he didn't believe the killings were motivated by money.
Sachs was scheduled to be arraigned on Monday, but the hearing was postponed until April 4.
He was being held without bail at the Central Men's Jail in Orange County. If convicted, he could face the death penalty.