Diagnosis: Murder (1993)

S06E11 Dead in the Water

Title: Dead in the Water Plot: While heading to a much-anticipated getaway in Carmel, Jesse's vehicle suddenly fails, leaving him and Susan stranded in a remote town. There, Susan spots her presumed-dead ex, Greg, who turns out to have staged his own demise to secretly loot a sunken ship. As the couple uncovers the truth, the locals, complicit in Greg’s scheme, turn against them, ultimately killing Greg and framing Jesse and Susan for his murder.