The murder case against an Orange County, N.Y., prosecutor who killed a rollerblader when he drove onto a hiking path while suffering delusions during a manic episode, is expected to end here today with the acceptance of his insanity plea.

Faced with the “highly unusual” and “overwhelming” agreement of five psychiatrists, Westchester County District Attorney Jeanine Pirro said yesterday she had no choice but to accept a disposition absolving Paul Harnisch of legal responsibility in the death of Edward Quirk.