A millionaire tire executive's affair with his personal secretary turned deadly when she allegedly stabbed his wife to death.

Chris Delaney, 63, who has served as the president of Goodyear's Middle East, Africa and Europe division since 2017, returned to his apartment in an upscale neighborhood of Brussels on March 17, and found his 61-year-old wife, Carmel Delaney, dead on the floor, the Wall Street Journal reports.

As he did not speak French, Delaney - who made $5 million a year - called his alleged lover Greet Vandeput, 54, who alerted the local police.

At first, Brussels police had believed Carmel's death was the result of a burglary - noting that the victim was caught on surveillance footage arriving at the apartment at around 8pm when she was confronted by a masked intruder.

Police claimed that suspect threatened Carmel to gain access to her home before stabbing her three times inside the apartment and fleeing with three valuable watches worth tens of thousands of Euros, the Brussels Times reported at the time.