Mark Presley Sr., 37, said that an officer stopped him about 3:30 p.m. and showed him a picture of the suspect. Presley, whose mother is a police officer , said he knew the man by the nickname "Fatman. "
As the search continued, the Cassidy family held vigil at Einstein, attended by dozens of police officers .
"There's a wonderful spirit of solidarity," Rigali said. "Everyone is hoping. Everyone is praying. There's no way of knowing just what will happen. "