Aaron Glee Jr, 49, was arrested on Sunday after police found the bodies of the two women near his Tallahassee, Florida home.
A 19-year-old Black Lives Matter activist Oluwatoyin Salau, had been missing since June 6, when she tweeted she had been molested by a black man, sparking hundreds on social media to call for a police search.
In a bombshell exclusive interview with DailyMail.com, Glee's mother, Sandra Cutliff, revealed that her son had called her from jail on Sunday night and confessed to strangling the young woman and also murdering his 'white grandmother', 75-year-old Victoria Sims.
Glee told his mother he met Salau on the bus, invited her to his home and let her shower there, Cutliff said.
He told Cutliff that Salau asked him for 'molly' (ecstasy) and when he refused she called him a 'n****r'
, the mother told DailyMail.com.
Glee then flew into a rage and strangled her to death, Cutliff said.
'He told me that after she got out of the shower she wanted molly. He told her he wasn't going to buy it. He said she called him a f***-ass n****r and bit him.
That triggered him off,' she said.
Sometime after the first alleged murder, Cutliff said Sims came to his house to check on him. The 75-year-old, a long-time volunteer for AARP Florida and member of Tallahassee Heights United Methodist Church, was friends with Glee and helped him look after himself and get government services, Cutliff told DailyMail.com. She said Glee referred to Sims as 'Miss Vicky' and his 'white grandmother' and would sometimes cook for her.
Cutliff said her son confessed that when Sims visited him last week she called him a 'slob', he became enraged again and killed her. The mother said she did not know when exactly her son committed the two alleged murders. Salau was last seen on June 6, and Sims on June 11.
On the day she disappeared, Salau shared a series of disturbing tweets about being molested by a black man who offered her a ride.
Police have not said whether or not Glee is the same man Salau accused of molesting before she disappeared. Cutliff said her son did not sexually assault Salau and does not have a vehicle. It has also emerged that Glee was arrested two weeks ago on May 30 for aggravated battery causing bodily harm and released on a $2,500 bond two days later.
His mother told DailyMail.com that the arrest occurred after Glee attacked a woman at a bus stop when she called him the n-word.
Prison records show Glee has an extensive criminal history dating back to 1989, including convictions for robbery, grand theft auto, credit card fraud, throwing a 'deadly missile' at a building and forging bills.