Nick had been staying at a high-end Los Angeles rehab facility that specializes in substance abuse treatment, which reportedly costs around $70,000 a month.
John's crucial tip surfaced after he began posting on Reddit, saying he recognized the suspect shown in the images released by authorities following Saturday's deadly shooting.
Two days after the Brown University shooting, around 8:30 p.m. on Monday, married father-of-three Nuno Loureiro was shot and killed in his Brookline, Boston home.
The disgraced executive said that both she and her then-boss were on friendly terms with their spouses and already separated when they went to the concert with her friends.
The jet is owned by GB Aviation Leasing LLC, a company linked to Biffle, though it's still not clear whether he was on the aircraft at the time of the crash.
Sajid and his son, Naveed, 24, are suspected of having carried out the attack during a Hanukkah celebration on Sunday, killing 15 people and leaving dozens of others injured.
Their daughter Romy, 27, who lives across the street, then went to check on them herself and called emergency services after discovering a horrifying scene inside the home.
Nick, who has cycled in and out of rehab over the years, said he got the idea to contact a sex worker online from another patient he met while attending outpatient treatment.