Donald Vasser was featured on "Washington's Most Wanted," a local law enforcement show in the style of "America's Most Wanted." It described the 39-year-old man as a "high-violent offender" with more than 20 arrests under his belt.
Seattle police spokeswoman Renee Witt says another parent recognized him and police were called in after the students came back to Lowell Elementary School on Wednesday. Vasser fled before police arrived, and officers were unable to find him even though the school was locked down.
Schools spokeswoman Teresa Wippel says officials are investigating how Vasser was able to get on the trip. She says that schools run background checks on chaperones.