S3·E19 Hutchinson: Murder One (a.k.a. Hutchinson for Murder One)

Out of the blue, Hutch's estranged former wife Vanessa suddenly contacts him, attempting to rekindle their relationship. Hutch doesn't want to know, until Vanessa claims that she's ill with a cancerous tumour. But the next day, Vanessa is murdered in Hutch's apartment – and Hutch is the prime suspect. With two Internal Affairs agents investigating and seemingly convinced that Hutch is guilty, Starsky must help his partner trace the real culprits in order to clear his name...