Leo apears on season 8 episode 21 (Kill Billie: Vol. 2), as a ghost to tell Piper he approves of them teaming up with a demon named Normed
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Leo's first appearance in Charmed was in the first season, episode 3. It's called 'thank you for not morphing.'
Forever Charmed, the series finale
He never died. He was just 'frozen' by the Angel of Destiny. He comes back during the last episode.
well in season 6 episode 6 they bang and therefore chris is concieved
I do not know the name of the episode but I am pretty sure there is at least one episode were Leo tickles Piper.