Four people, including a two-year-old boy, were gunned down, with their bodies left on the floor of a chicken processing factory in George Town, Penang, yesterday morning.
The dead are jockey Chung Wah Tong, 27, his two-year-old son Ah Bee, Mr Chung's mother Ms Tan Saw Sim, 55, and her boyfriend Toh Hock Choon, 50.
Mr Toh is believed to be the owner of the chicken factory. The killer is believed to be a family member, New Straits Times reported.
Mr Chung, who works as a jockey in Kuala Lumpur and was on holiday, had previously raced in Singapore.
Police believe the shooting happened as the victims were sleeping in the factory's living quarters, a makeshift container.
They are believed to have been killed with a 9mm semi-automatic pistol. The killer fled the scene in a pickup truck belonging to Mr Toh.
Mr Chung spent four years as an apprentice jockey in Malaysia before seeking greener pastures in Singapore.
He arrived at the start of this year and was apprenticed to Singaporean trainer Leslie Khoo. But the his stint did not last long.
He was hauled up by Singapore Turf Club stewards for a bad ride aboard the Alwin Tan-trained Real Hero on Feb 19.
At an inquiry, he copped a one-year disqualification for failing to take all reasonable and permissible measures to obtain the best possible placing in the race. He finished third on the horse.
He returned to Penang after that. His best effort from 31 rides at Kranji was a third placing.
During his four years of riding in Malaysia, Mr Chung did not do too badly for an apprentice jockey.
He rode seven winners and nine placings in his first season in 2012.
He had eight wins and 16 placings in 2013, seven wins and 13 placings in 2014 and eight wins and 14 placings last year. - Additional reporting by Tan Thean Loon
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