SANTA ANA—A 45-year-old Lake Forest man is behind bars on a murder charge for allegedly beating his longtime spouse to death with a tire iron as she was arriving for work as a family’s nanny in Irvine, prosecutors said March 23. Omar Velazquezhuar is charged with murder a special circumstances allegation of lying in wait, which makes him eligible for the death penalty or at least life in prison without the possibility of parole if convicted at trial. Velazquezhuar is accused of killing 48-year-old Dora Maria Rosas Moreno of Santa Ana on Feb. 26. The two had been together for 23 years, but it was unclear if they were married, said Deputy District Attorney Mark Geller. The two had split up and the defendant was allegedly jealous that the victim had “moved on” and was seeing someone else, Geller said. The two have a 20-year-old son and 18-year-old daughter. The …