LOS ANGELES—A 70-year-old nurse died Jan. 16 among her colleagues at the hospital where she had worked for nearly four decades, succumbing to injuries suffered days earlier in an attack by a homeless man while waiting for a bus near Union Station to make her morning commute. Sandra Shells was attacked about 5:15 a.m. Thursday near Vignes Street and Cesar Chavez Avenue, a short distance from Union Station, as she waited to catch a bus to her job at Los Angeles County-USC Medical Center, according to the Los Angeles Police Department. Soon after, police arrested a 48-year-old homeless man who was found sleeping a short distance away. He was identified as Kerry Bell. Police say Bell punched Shells in the head, causing her to fall and strike her head on the ground. He was arrested without incident on suspicion of assault, but his charge will be updated to suspicion of …