LONGVIEW — The Cowlitz County sheriff’s deputy shot in the line of duty Saturday night has died, and a manhunt for the “suspect or suspects” is ongoing, according to Clark County investigators. Sheriff’s officials Sunday afternoon identified the fallen deputy as Justin DeRosier, 29.Authorities previously said they had found a person of interest in the shooting, but they announced Sunday afternoon that at least one suspect is still being pursued. They did not disclose any names.DeRosier died at PeaceHealth Medical Center in Vancouver a short time after he arrived there by LifeFlight helicopter, the sheriff’s office reported. DeRosier leaves a wife and a five-month old daughter, his first child. He is a 2008 Kelso High School graduate and has been a deputy for the Cowlitz Sheriff’s Office since 2016. He also is a criminal justice graduate of Washington State University (2012).DeRosier “was a Kelso boy,” County Sheriff Brad Thurman said. He is a member of a family with deep Cowlitz County roots. His grandmother, Darlene DeRosier, was a long-time Cowlitz County auditor. Reached by phone Sunday afternoon, DeRosier was too upset to comment.