The actress behind Lucy is Zoe Margaret Colletti. 20-year-old Zoe has already built up an impressive acting resume for her age, appearing in multiple episodes of Fear the Walking Dead and Boo, Bitch.

Although her Only Murders in the Building character Lucy isn't technically Charles's daughter, she clearly wishes that were the case. In a heartwarming moment, she tells Charles that he was the best father figure she had out of her mother's boyfriends over the years.

Lucy admits to Charles that she skipped out on her mother's wedding because the guy she married wasn't Charles. They bond over Charles' cheesy hit single "Angels in Flip-Flops," that was a huge hit in Germany.

Charles is horrified when Lucy discovers the bloody knife that took Bunny's life. Lucy discovers how someone's planting evidence — there's a secret series of tunnels connected to Charles's apartment!

What Lucy doesn't tell Charles is the most crucial piece of evidence in the case so far. She was hiding in the secret tunnel-way the night that Bunny was murdered. The murderer was clearly aware of the passageway, too, because they nearly ran into Lucy when they were fleeing from the scene of the crime!

Completely oblivious to Lucy's huge clue, Charles sends her back home. He doesn't want her to be harmed during their ongoing investigation.