William Truesdale, an Alexandria deputy sheriff who was killed in the line of duty 30 years ago. (Courtesy of Alexandria Sheriff's Office)

Alexandria renamed its jail in honor of William Truesdale, an Alexandria sheriff’s deputy who was shot and killed by a prisoner in 1981. He had four children, including a six-month-old boy named Kevin. And on the same day that the jail was named for the father he never knew, Kevin Truesdale was sworn in as an Alexandria sheriff’s deputy.

“This is a goal I set when I was 6 years old,” Kevin Truesdale told The Post’s Allison Klein this week. He attributes some of his motivation to his own passion for law enforcement — but most of it to his father’s memory.

“What better way to pay tribute to his father than to serve in the same capacity as he did and continue his father’s legacy?” Alexandria Sheriff Dana Lawhorne said. Lawhorne was in the honor guard for William Truesdale’s funeral 30 years ago.

Kevin Truesdale with his mother Zita Truesdale Noyes, at left,views a memorial that was unveiled inside the Alexandria Adult Detention Center, renamed as the William G. Truesdale ADC in honor of his father. (SUSAN BIDDLE/FOR THE WASHINGTON POST)