Who was Columbo`s Wife?

Answer 1

She was never mentioned by name in the series, but they did eventually give her her own series and it was played by Kate Mulgrew

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a spin-off TV series titled Mrs. Columbo and starring Kate Mulgrew was aired in 1979, but it received a dismal reception and was swiftly cancelled. It especially disappointed fans of the original movies, because in the Columbo movies Mrs. Columbo is often referred to, but never seen (although there is no doubt that she actually exists — several characters on screen have met Mrs. Columbo over the years). The mystery of what Columbo's often-talked about wife was "really" like was an important part of the original show's appeal, and showing an actual Mrs. Columbo seemed to take something away from the Columbo mystique.