From Homicide: "Night of the Dead Living"

If you spent any time in Baltimore without air conditioning, you know how hot it gets, even at night. This was the story of one night, and wondering about a candle that was always lit in the squad room, mysteriously, and how a roomful of the city's best detectives couldn't figure out how, who or why it was there.

Script quote courtesy of Homicide: Scripts on the Street.

(Crossover note; PO Thormann is played by Lee Tergesen, later Beecher of "Oz.")

Inside the squadroom, Munch blows out the candle. Thormann, wearing a tuxedo, walks over to him.

Thormann: What do you do that for, every night?

Munch: What's with you?

Thormann: I gotta got to a wedding.

Munch: At this hour?

Thormann: It's a long story. The wedding's in Connecticut - Old Saybrook. Eva and I are driving up.

Munch: Uh-huh.

Thormann: I know you're the one who lights the candle.

Munch: Yeah.

Thormann: So, why?

Munch: It's for all the ones who've been killed.

Thormann: Uh huh.

Munch: What I don't know is, who lit it when I was gone?

Thormann: I did.

Munch: You?

Thormann: Yeah.

Munch: Why?

Thormann: I figured it was important to you.

Munch: It's gonna be our little secret, okay?

Thormann: Yeah, sure, okay.

The air conditioning kicks in.

Munch: Air conditioner's working.