Dr. Frank Ryan's last tweet caused his death, ex-girlfriend says
"He lived up in Malibu on a tiny street and he was texting while driving, and he accidentally went over the cliff," his ex-girlfriend Charmaine Blake tells People.
She says Ryan's family was told by police investigators that texting while driving contributed to the fatal crash.
Minutes before the crash, Ryan's Twitter account reads, "After 25 years of driving by, I finally hiked to the top of the giant sand dune on the pch west of Malibu. Much harder than it looks! Whew!"