[1][12][5] Stefano Brizzi was born 26 June 1966[5] in the comune of San Marcello Pistoiese, Pistoia, Tuscany, Italy[13] and was raised Catholic.
[14] Brizzi studied at the University of Florence[15] before moving to London in 2012 and getting a computer programming job at Morgan Stanley.
[5] He later joined a support group for his drug addiction called Crystal Meth Anonymous[13] Brizzi also became a Satanist as a "rejection of Christian values".
[2][18] Semple arrived at Brizzi's house where the two organised a sex party, inviting other men to the flat.
[20] After failing to return home, Semple's partner, Gary Meeks, reported him missing that evening.
[18][21] Thousands of people later joined a Facebook group that Semple's niece, Kerry Nicholas, set up to help search for him.
[22][23] On 5 April, Brizzi was filmed on CCTV at Leyland Specialist Decorators' Merchants, a DIY store near his house,[24] where he bought buckets, metal sheets, acid bottles, and cleaning products to dispose of Semple's body.
[4] While he was being arrested, Brizzi confessed to them that he had killed a police officer he met on Grindr and that he tried to dissolve the body.
Inside Brizzi's flat, police found "globules" of flesh in the bath, which was filled with sodium hydroxide and spirits of salt containing hydrofluoric acid;[5][27] bags containing bones; parts of Semple's head; and pools of human fat in the oven.