The horrific murder will be revisited in the Netflix documentary The Murder of Rachel Nickell

New texts show Mackenzie Shirilla told Dominic Russo she was scared her condition was 'just gonna get worse'

Steve Shirilla was placed on administrative leave from the school he worked at following the release of Netflix's The Crash

Watts said he had been 'thinking about killing his family for weeks'

Shirilla announced her plans during a prison call with her mom, Natalie

The 21-year-old is the subject of a new true crime Netflix documentary

Mackenzie Shirilla and her mom Natalie were heard speaking in 'code' in newly obtained jail calls

Both seasons of the crime thriller boast all-star casts

The Crash on Netflix has brought renewed attention to Mackenzie Shirilla's case

Gypsy Rose Blanchard said remorse was about to hit Mackenzie Shirilla 'like a train'

The 21-year-old was sentenced to life in prison after murdering her boyfriend by driving her car 100mph into a brick wall

Its 256 windowless cells house an average of 80 to 156 inmates each

Shyann Topping was reportedly Mackenzie Shirilla's girlfriend behind bars, but their romance 'fizzled out'

CECOT prison in El Salvador holds 40,000 of the world's most deadly criminals

Newly discovered texts show 'threats' Dominic Russo had received from Mackenzie

The body language expert 'couldn't believe what he was seeing'

Being behind bars has not ended killer Mackenzie Shirilla's love life, with her prison girlfriend sharing what it was like to date her

Mackenzie Shirilla's chilling decision to drive a car into a wall at 100mph has been re-examined in Netflix's 'The Crash'

Cindy Watts also explained why she did not attend Chris and Shanann's 2012 wedding

The convicted killer claims his child's last words were "Daddy, no!" before he smothered her with a blanket

The documentary is currently at number one on Netflix, but it could have serious legal repercussions for her parole in 2037

Mackenzie Shirilla was convicted of 12 counts of felony

Kate McCann said she will 'bitterly regret' a note that she believes may have led to Maddie's disappearance

Mackenzie Shirilla's fatal car crash killed her boyfriend, his friend, and landed her with a potential life sentence