The Late Show

The Late Show is a movie starring Art Carney, Lily Tomlin, and Bill Macy. A grumpy semi-retired private investigator partners with a quirky female client to catch the people who murdered his partner.
Over-the-hill gumshoe in Los Angeles seeks to avenge the killing of an old pal, another detective who had gotten himself involved in a case concerning a murdered broad, stolen stamps, a nickel-plated handgun, a cheating dolly, and a kidnapped pussycat.