The former partner of Monique Lezsak paid tribute to the mother of his twin daughters this afternoon as he confirmed the professional bodybuilder was found dead by police in an Endeavour Hills home about 7.30am.
Lezsak's current partner was taken to the Alfred Hospital under police guard with serious upper body injuries, while one of the nine-year-old twins was taken to Monash Hospital with minor injuries.
"She has put so much into our kids and even her own family, she's just the most beautiful person," Jye Carter told reporters outside the family home.
"She is the most decent person I've ever met in my life, a loving caring mother, she's achieved so much in her life."
It is understood the girls were at the home during the alleged stabbing.
"I couldn't fault her in any way. I was with her for 10 years. We haven't been together since 2015, but she's just a decent person. She's a good mum," Carter added.
9News understands the man under police guard had been dating Lezsak for several years.
He remains in hospital in a critical condition.
The homicide squad is investigating and collected evidence from the home today.
Police earlier said an altercation occurred between a man and a woman known to each other.
Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14.
If you or someone you know is impacted by sexual assault, domestic or family violence, call 1800RESPECT on 1800 737 732 or visit 1800RESPECT.org.au. In an emergency, call 000.
Sign up here to receive our daily newsletters and breaking news alerts, sent straight to your inbox.