There have been a number of versions of this series, going back to the radio days.
This is the earliest of those versions. It stars Richard Hart, and was on the old Dumont
Network, premiering in October, 1950. Exact episode dates for our shows are not known.
This is an example of some of the earliest television detective work.

Adventures of Ellery Queen (1951 series)

Killer D.A.
Death Spins a Wheel
Carnival Killer
Murder to Music....with original commercials
Man Who Enjoyed Death
Man Who Killed Cops (Lee Bowman as Ellery)  w/ Harry Bellaver

Adventures of Ellery Queen (1970s remake, with Jim Hutton, David Wayne)

Auld Lang Syne
Sinister Scenario
Miss Aggie's Fairwell Appearance   w/ Eve Arden, Betty White
Pharaoh's Curse w/June Lockhart, Ross Martin, Nehemiah Persoff
Blunt Instrument   w/John Dehner, Eva Gabor, Dean Stockwell
Black Falcon
Eccentric Engineer  w/ Dorothy Malone, David Hedison, Ed McMahon
Comic Book Caper
Sunday Punch
Mad Tea Party
Veronica's Veils
Wary Witness  w/ Sal Mineo, Michael Parks
Two-Faced Woman   w/ Vera Miles
Tyrant of Tin Pan Alley
Caesar's Last Sleep
Too Many Suspects  w/ Ray Milland, Kim Hunter, Monte Markahm
Don't Look Behind You
12th Floor Express