Geoffrey Shyam Stirling was killed just six months after the death of the siblings' mother, Judy Stirling.

“My family has experienced an unimaginable loss,” Lydia announced in a Saturday nightInstagram post.

“My brother, Geoff, was tragically taken and our hearts are shattered.”

BEVERLY HILLS, CALIFORNIA - AUGUST 24: Fashion Editor Lydia McLaughlin attends the Aesthetic Everything Beauty Expo Gala as Franz Skincare and Biosensor Lab Receive Awards at the Aesthetic Everything Beauty Expo Gala Dinner on August 24, 2019 in Beverly Hills, California.

Lydia McLaughlin.Credit:Greg Doherty/Getty

“Shortly after being stopped, Stirling became uncooperative and assaulted the officer,” the post stated.

At that point, an officer-involved shooting occurred."

California Attorney General Rob Bontaannouncedon Friday that his office is looking into the shooting.

THE REAL HOUSEWIVES OF ORANGE COUNTY – Season:12 – Pictured: Lydia McLaughlin

Former ‘The Real Housewives of Orange County’ star Lydia McLaughlin.Tommy Garcia/Bravo/NBCU Photo Bank/NBCUniversal via Getty

The investigation is ongoing.

The California Department of Justice did not immediately respond toEntertainment Weekly’s request for comment.

“This was the song he turned to after we lost our mom.

Lauri Peterson and Joshua Michael Waring

He’d cry every time,” Stirling wrote of her brother.

I know they’re both with Jesus now, and He’s walking with me through this darkness.

One step at a time.

Shannon Storms Beador

Thank you to everyone who has been praying for us."

“Grief can make you better or bitter,” she wrote.

She will always be my hero, and my favorite."