For series like Supernatural, Forever, Republic of Doyle, NCIS, MacGyver, Airwolf, Magnum PI, Monk, Chicago Fire, Lethal Weapon, and so on.
Supernatural, I like. (Castiel is cool, but he did not kill a revived Hitler or even Death. Dean did both.)
Forever too (pity it had only one season).
And Riggs dies in Lethal Weapon (a shock; he was my favorite character).