Six Massachusetts men have pleaded not guilty to felony aggravated assault charges stemming from a brutal beating at a Tim McGraw concert in Mansfield.

Police say 19-year-old Michael Skehill of Westwood was nearly killed Sunday. He's in serious condition but is expected to recover.

A judge in Attleboro on Friday ordered one suspect, 20-year-old Perry DiMascio, held without bail after revoking his bail on an unrelated case. Bail of at least $2,500 was set for the others.

The beating appears to have started over a girl and was exacerbated by alcohol consumption.

The suspects were arrested Thursday and Friday. They include 22-year-old Brendan McCulloch; 21-year-old Michael Adams; 21-year-old Kevin Anderson; 21-year-old Daniel Morizio and 20-year-old Shane Dossantos.

Their attorneys have questioned the reliability of the evidence and witness testimony.