PORTLAND, Maine — A 3-month-old known as Leo was rushed to the hospital last Wednesday. He died over the weekend.

It is currently not clear how baby Leo was killed. Baby Leo’s father is accused of murdering him. He appeared in court for the first time on Monday.

Eugene Martineau, who goes by Charlie, couldn’t contain his emotions as he was led into court. Crying, with his attorneys by his side, Martineau was charged with the murder of his 3-month-old son.

Leo was brought to Maine Medical Center on Wednesday with several injuries. He passed away on Saturday.

Police said Leo and his parents lived together at a home in Standish. Belinda Moore, who lives next door and used to babysit Leo, said she asked to adopt the child several times.

“I wanted to take care of him. I said it very loud and clear to the parents, ‘I love baby Leo, I wanted baby Leo,’” Moore said. “I was not happy the way he was being cared for by either parent.”

The baby’s mother has not been charged and was not in court Monday. Baby Leo was a twin. Officials said his sister is under state care.