A 56-year-old man was behind bars Friday in connection with the fatal self-inflicted shooting of a 13-year-old boy in Irvine. Christian Douglas Yeager of Irvine was booked on suspicion of criminal storage of a firearm and child endangerment. Meanwhile, the circumstances of the shooting, which occurred about 2:40 p.m. Thursday, remained under investigation. According to Kyle Oldoerp, a spokesman for the Irvine Police Department, the teen was at a residence with two other boys near Heathergreen and Weepingwood when the shooting occurred. The teen did not live at the home. One of the other boys was present in a bedroom when the shooting occurred, but the other was not, Oldoerp said. The gun used in the shooting belonged to Yeager, who did not have it properly secured, he said. Yeager was not home at the time, but an adult female family member was there, Oldoerp said. Police recovered “numerous unsecured firearms” registered to Yeager at the home, Oldoerp said. Investigators were working to determine whether the shooting was intentional or accidental. The teen was a student at South Lake Middle School. The eighth-grader would have