The victim, identified as Syed Habeeb (21), recently had an heated argument with the suspect Mohsin over a family issue, after which the latter bore a grudge against him.
Detective Inspector Scott Beard said police were called to the house in the suburb of Epsom at about 11:30 am and found three people in critical condition.
According to the police, Mohammed Faizal (25) and Ahmed Fahad (26) recently had a fight and Fahad was waiting for an opportunity to allegedly eliminate Faizal.
According to a letter written by his wife Mehnaaz Fatima to External Affairs Minister S. Jaishankar, Mohiuddin was running a grocery store in Georgia for the last 10 years.