Published: Jun 21, 2010 4:38 PM EDT
Updated: Jun 21, 2010 1:13 PM EDT

FORT MYERS, Fla.-The Lehigh Acres grandfather accused of killing his 3-month-old grandson, entered a plea of 'not guilty' Monday in a Lee County courtroom.

Manuel Rosales didn't say a word when deputies brought him into the courtroom.  He was shackled around his wrists and ankle and was also wearing a suicide vest to stop him from injuring himself.

Rosales is accused of murdering the baby and also trying to murder his daughter by slashing both of their throats.

The daughter survived but the baby died from his injuries.

Rosales is facing first degree attempted murder charges and first degree murder charges.

Prosecutors may seek the death penalty.

Rosales is being held in jail without bond.

The next status hearing is in August.