OAKLAND — Authorities allege a Pleasanton man urinated on a stack of Walmart purchases from his mother and father’ latest buying journey, then used two 3D-printed handguns later that evening to gun down his father of their shared residence, based on courtroom information filed Wednesday.
Alameda County prosecutors have charged Lucas Chan, 28, with homicide within the deadly taking pictures of his father, Lance Chan, who later died at a hospital. The youthful Chan additionally faces six further counts tied to a number of suspected do-it-yourself bombs that investigators seized from his bed room, amongst different expenses, based on courtroom paperwork.
The taking pictures introduced a grotesque finish to what authorities described in courtroom papers as an in any other case abnormal day, which started with Chan’s mother and father going buying at Walmart with one other couple.
Lucas Chan instructed investigators that he grew to become enraged Friday at seeing a automobile belonging to his mother and father’ mates on the Chan family, as a result of he claimed that a type of individuals had beforehand sexually assaulted him, based on the courtroom paperwork.
Whereas Lucas Chan’s mother and father and their mates have been away at dinner that evening, he walked out of his bed room and — in an try at revenge — urinated on the baggage of merchandise that his mother and father and their mates left behind on the home, the courtroom information stated. He then allegedly retreated again to his room, the place he stayed till his mother and father and their mates returned to seek out their belongings soaking moist.
At round 9:30 p.m. Friday — someday after his mother and father’ mates had left — Lucas Chan’s mom and father tried speaking to him via his bed room door, based on the courtroom paperwork. When he didn’t reply, Lucas Chan’s mom walked to a different a part of the home.
Based on what Lucas Chan instructed police, a number of minutes later he claimed his father stated one thing alongside the traces of, “You wanted our attention, now you have it,” the courtroom information confirmed. At that second, Lucas Chan stated he clutched a gun in every of his palms — each of which he had constructed from a personally owned 3D printed — and allegedly opened hearth at his bed room door, based on the courtroom filings.
Lucas Chan then recalled listening to his mom’s cries as she tried serving to her husband, after which he known as 911 and waited in his room for police to reach, based on the courtroom paperwork.
He instructed investigators that he had been not sure about who had been standing on the opposite facet of his bed room door. He allegedly had grown more and more reclusive over the previous three to 4 years — basically slicing off communication together with his mother and father in that point. He hardly ever left his room, Lucas Chan’s mom later instructed police detectives.
The youthful Chan remained held with out bail Wednesday at Santa Rita Jail. He briefly appeared in courtroom for an arraignment listening to Wednesday. He’s set to enter a plea on Aug. 27.
Initially Revealed: August 20, 2025 at 6:53 PM PDT
