Serial killer Dorothea Puente poisons seven people in her boarding house and buries them in the backyard; designers Joelle and Mikel visit the current owners to replace the home's negative energy with a new makeover.

The Puente house provides Mikel and Joelle plenty of challenges, including a junk-filled backyard, a storage shed they can't tear down and the fact that police never found all the body parts from the victims buried in the yard.

It's reveal day; the homeowners have no idea what Mikel and Joelle have changed.

William Bradford shoots and kills his wife in their living room; years later, John and Karina buy the house without being aware of its tragic history; now, they are desperate for a positive change.

Designers Mikel and Joelle work overtime to give a fresh look to the home and a completely revamped living room; first, they need to find out if the murder weapon is still hidden in the fireplace.

Homeowners John and Karina are coming back soon and tensions are running high; Mikel and Joelle make some bold design decisions for the home.

Frederick Hengl is arrested for dismembering and cooking his wife in their home; Chelsea and Oliver buy the house and are looking for a fresh start for their growing family.

Mikel and Joelle tackle the renovation of the Hengl house; things get complicated when the team finds bloody evidence of the murder under the bathroom floor.

With a brand new backyard, a modernized bathroom and transformed curb appeal, the designers hope the "Blue Murder House" will become a happy home for Oliver and Chelsea.

Jozsef Barsi kills his daughter, Judith, a child actress, in their home; for the past 15 years, Gaby has slept in the same bedroom where this tragedy occurred and is desperate to rid the house of its dark energy.

Mikel and Joelle have their work cut out for them; this isn't just about flipping a young girl's bedroom, it's about using design to take away the sting of trauma.

This reveal feels different for Mikel and Joelle; the homeowners have suffered for years because of the tragedy that happened in their home, and the redesign may actually help them change their lives.

Caitlin and J.R. buy the house where Jodi Arias murdered her boyfriend.

Quincy and Amanda learn their new home was the site of a gruesome murder.

Karina and her kids move into a house where the Golden State Killer committed one of his crimes.

Actor Carl Switzer ("The Little Rascals") is shot and killed in a Mission Hills, Calif., home.

Effat buys the home where Laura Purviance killed her mother; a former tenant shares a revelation.

While closing on their house, Alex and Britt learn it is the site of a massacre.