The parents of an Australian man jailed over the death of a grandfather in Singapore are pleading for leniency in his case, describing their son as loving and caring.

Andrew Gosling, 47, is accused of throwing a glass bottle over a high-rise apartment balcony, hitting and killing 73-year-old Nasiari Sunee.

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He was arrested on so-called “killer litter” charges last week.

“It isn’t like him at all. He’s loving, he’s caring,” his mother Pam Gosling said.

“(He) hasn’t got a malicious bone in his body.”

Gosling was described as "loving" and "caring" by his parents. Credit: 7NEWS

Pam and husband Ian are unable to comprehend how their son is sitting in a jail cell, 6000km from home in Melbourne.

“Something completely foreign, something we can’t comprehend,” Ian said.

The pair describe their son as a considerate, thoughtful man.

Nasiari Sunee (right) was killed by the glass bottle. Credit: 7NEWS

“We'll support him all the way. We'll always be there for him," Pam said.

"We just want to get through this, and he'll get through it, because we're strong and he's strong.”

Nasiari was a father of four and grandfather of nine.

Sunee was in the barbecue area of the apartment block. Credit: 7NEWS

He was with his family at the apartment block’s barbecue area when the incident occurred.

7NEWS understands Gosling, who’d only been in Singapore for less than a month, was in the nearby pool earlier and there’d been an argument.

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“He’s here to take steps and to come clean,” Gosling’s lawyer Gloria James said.

His legal team is trying to build its case that he was a man of good character.

His parents shared photographs of him. Credit: 7NEWS

They pointed out that not only did he not try to flee Singapore, he turned himself in.

Gosling is back in court next Tuesday.