We signed up for Fubo and they have a lot of true crime shows. I, too, need to get my true crime fix.
One of our TVs has Roku which has reruns of older not-true crime shows — Cold Case, Without A Trace. IMDB via Roku has In Plain Sight. There are several.
I’ll have to check and see. Discovery is a great deal for $4.99/month though, and they have the complete series of all the Investigation Discovery programs.