His attorneys claim there is not enough evidence linking the former Patriot to the 2012 drive-by shooting of two men.
Garsh says in the decision released Wednesday that prosecutors proved their case beyond a reasonable doubt.
Hernandez was convicted last month in the 2013 murder of Odin Lloyd, who was dating his fiancee’s sister.
A state prisons official says Hernandez was moved Wednesday to the maximum-security Souza-Baranowski Correctional Center in Shirley.
Hernandez is accused of killing Daniel Abreu and Safiro Furtado in the South End.
Jurors have spent more than 27 hours deliberating since last week. They are due to resume deliberations Tuesday morning.
Jurors in the murder trial of former New England Patriots player Aaron Hernandez spent nearly 20 hours last week considering whether to convict him of murder.
A look at the important dates in the Aaron Hernandez case.
Jurors in the murder trial of former New England Patriots tight end Aaron Hernandez are expected to begin deliberations this week after hearing more than two months of testimony.
New England Patriots owner Robert Kraft took the stand Tuesday morning in the murder trial of former football star Aaron Hernandez.