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A Pleasanton resident was arrested last Friday for allegedly killing his 61-year-old father over a verbal dispute, according to new details from the Pleasanton Police Department Monday evening.

PPD said in its press release Monday that Lucas Chan, 28, shot and killed his father Lance near the 4600 block of Helpert Court on Aug. 15.

“Preliminary witness accounts indicate that the shooting was preceded by a verbal dispute,” PPD Lt. Nicholas Albert stated in the press release. “Currently, there is no known threat to public safety. The investigation is ongoing, and no further details are available.”

According to a previous press release, police searched Chan’s residence and allegedly found suspected improvised explosive devices, which were removed by the Alameda County Sheriff’s Office Explosive Ordinance Disposal Team.

Monday’s press release stated that the sheriff’s office and PPD also partnered with the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) due to the “recovery of the explosives, as well as additional evidence, including a 3-D printer and multiple ‘ghost guns.’ ” 

According to the Alameda County Sheriff’s Office Inmate Locator, Chan is currently being held at Santa Rita Jail with no bond and is awaiting his arraignment hearing set for Wednesday morning.

He is being charged with several counts, including first degree murder, possession of a destructive device and making a destructive device without a permit.

Anyone with information about the case is being asked to contact the Pleasanton Police Department at (925) 931-5100.

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Christian Trujano is a staff reporter for Embarcadero Media's East Bay Division, the Pleasanton Weekly. He returned to the company in May 2022 after having interned for the Palo Alto Weekly in 2019. Christian...

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