He plied him with a fatal dose of GHB at his home in Bolton Road, Chessington, Surrey, then left with his bank card details and other belongings.
Mr Michels, who had an uncredited role in Skyfall, was one of 12 men targeted by Matovu and his lover Brandon Dunbar, 24, over a 19-month period, jurors heard.
Following an Old Bailey trial, Matovu was found guilty of murdering Mr Michels and a string of other offences.
Jurors were not told about Matovu’s past connection with former chef Port, 44, from Barking, who had also targeted victims through Grindr and killed them with GHB overdoses.
Port was handed a whole life term for raping and murdering four young men and dumping their bodies near his home in Barking, east London, between 2014 and 2015.
Following Port’s 2016 trial, Matovu pleaded guilty to supplying mephedrone and GHB and offering to supply GHB, but denied knowing what Port planned to do with it.
In April 2017, Matovu was sentenced to 12 months community service, 150 hours of unpaid work and 40 days of drug rehabilitation.
At Matovu’s murder trial, prosecutor Jonathan Rees QC told how the defendants took advantage of Grindr hook-ups to steal property and bank details.
On the evening of 16 August last year, divorced father-of-three Mr Michels made contact with Matovu on Grindr after a night out in Soho gay bars.
Mr Michels invited him to his place in southwest London for sex, the court heard.
While there, the defendant drugged Mr Michels and took photographs of his bank cards and driver’s licence.
Matovu made off with a MacBook, mobile phone, an initialled black case, US driving licence and various cards as well as a suitcase full of bottles of alcohol.
Mr Michels’ body was discovered by his concerned family the following day in bed under a duvet.
An empty 3ml syringe without a needle attached was found on the floor beside the bed. DNA from the victim and defendant was identified on it, as well as traces of GHB, the court heard.
Matovu denied murder but accepted going home with him to have consensual sex.
He denied administering GHB to Mr Michels, claiming he took it of his own free will.
A jury deliberated for 26 hours to reach guilty verdicts on all the charges against both defendants.
Matovu, of Southwark, south London, had pleaded guilty to some of the charges against him.
In all, he was convicted of six counts of administering a noxious substance, seven thefts, six counts of having articles for fraud, murder, assault by penetration, assault occasioning actual bodily harm and possessing GBL drugs.
Dunbar, of Forest Gate, east London, was found guilty of three counts of administering a noxious substance, five thefts, six counts of having articles for fraud, two frauds, assault by penetration, assault occasioning actual bodily harm, and dishonestly retaining wrongful credit.
Judge Anne Molyneux QC remanded the defendants into custody to be sentenced on 5 September.
Additional reporting by Press Association