21st Century Serial Killer

S01E02 Stephen Port preyed on young men though his grindr account, he spent hours searching web porn, a predator and he was to take the lives of four much-loved young men. The sisters of one victim chose to take on a challenge; to prove their brother, Jack, had not died from a self-inflicted overdose, as claimed by the police, but had been murdered, along with three other men.