Apparently the brother angle is fake news.
https://nypost.com/2023/08/23/final-moments-revealed-of-shop-owner-gunned-down-over-pride-flag/
The man who shot and killed a beloved California shop owner over a Pride flag outside her boutique seemed to pause before grabbing his gun — as if he had second thoughts before opening fire.
Travis Ikeguchi, 27, the son of a cop, tore down the rainbow flag outside clothing store Mag.Pi in Cedar Glen on Friday, shot Laura “Lauri” Carleton and fled — but was later killed in an exchange of gunfire with police, officials said. Meanwhile, more details have emerged about the killer’s troubled life and fringe views.
Ikeguchi was the son of a Florida Highway Patrol trooper, but wrote often about his mistrust of law enforcement — and even considered killing a cop, the LA Times reported. He moved to California with his sister and mother after his parents split in a messy 2018 divorce that left him with animosity toward his dad, according to the news outlet.
In 2019, Ikeguchi wrote that he and his mother lived in their car and were struggling to make ends meet, so he started a GoFundMe campaign asking for money for housing and food.
Thanks. I see reading elsewhere it was not her brother.