VENTURA COUNTY ( KTLA) -- Famed plastic surgeon, Dr. Frank Ryan, was killed because he made an "unsafe turn" along Pacific Coast Highway, not because he was texting and driving, according to California Highway Patrol officials.

The 50-year-old Beverly Hills surgeon died Aug. 16 after rolling and crashing his Jeep Wrangler off PCH at Deer Creek Rd. in Ventura County.

Ryan was trapped inside the vehicle with major head injuries. His dog, Jill, was thrown from the vehicle but survived.

The doctor, whose clients included Heidi Montag, Vince Neil and Lorenzo Lamas, had posted a twitter message just moments before the crash, causing people to speculate that he was texting while driving.

The CHP concluded this week that an unsafe turn was the sole cause of the crash.

"There was no evidence of any other contributing factors in the cause of this collision," investigators said.

Ryan's last twitter post read, "After 25 years of driving by, I finally hiked to the top of the giant sand dune on the [Pacific Coast Highway] west of Malibu. Much harder than it looks! Whew!" That missive was followed by a photo of Jill looking out at the Pacific Ocean with the caption, "Border collie jill surveying the view from atop the sand dune."