(Portland, OR)  --  A Clackamas County jail deputy is behind bars on a felony strangulation charge related to domestic violence.  Police arrested 34-year-old Brandon Kearns yesterday and booked him into Clackamas County jail.  Police began investigating him Tuesday after learning he'd been accused of assaulting his ex-girlfriend on a recent trip to Las Vegas.  Investigators then learned he was accused of strangling the same woman earlier this year in January.  Bail is set at 100-thousand dollars.