Mabrey pleaded not guilty in February to charges of second-degree murder, gross vehicular manslaughter, felony driving under the influence and hit-and-run.
In fact, tests showed that his blood alcohol level was nearly three times the legal limit.
The 45-year-old man also left the scene of the crash so he could get a burger at a nearby restaurant, leaving Dowdy lying in a pool of blood.
Mabrey may now have to spend the rest of his life in prison for killing the 24-year-old woman. A San Diego jury convicted him Tuesday of second degree murder, gross vehicular manslaughter and hit and run causing death.
"Nothing will bring my beautiful daughter back to me and it is a tragedy," said Emily Dowdy's mother Ellie. She listened to the verdict with a large group of family and friends.
Mabrey has a long criminal history involving DUIs. He has six prior convictions in Texas and Colorado, including two felony convictions. He cringed when the verdict was read.
The jury took about two days to deliberate before reaching its unanimous decision.
"I think the entire jury feels very good about its decision that we made the right decision and we made it unanimously," said juror David Poole.
Defense attorneys tried to convince the jury that Dowdy was not in the crosswalk when she was hit, but prosecutors argued that she legally crossed the road.
Mabrey will be sentenced on December 15. He could get up to 19 years to life in prison.