How a "throuple" relationship ended in a Florida murder mystery

From reality television, to the plot of "Bridgerton," 2024 might very well be the year of the "throuple." The polyamorous relationship involving three romantic partners, instead of the more conventional two, seems to be popping up everywhere. 

And a throuple is at the center of a murder investigated by "48 Hours" and correspondent Peter Van Sant in "Who Killed Aileen Seiden in Room 15?" airing Saturday, Oct. 19 at 10/9c on CBS and streaming on Paramount+. 

"We needed to know what happened inside that hotel room outside of three people entered and two came out carrying a body," said Franklin County Assistant Prosecutor Jarred Patterson.