Cops: Teen arrested in fatal Mastic stabbing

An arrest has been made in the fatal stabbing of a Mastic teen.
Police say 19-year-old Michael Dennis fatally stabbed 17-year-old Trevor Bender on Mastic Road Friday night.
They say Bender was stabbed in the chest after he got into an argument with a group of acquaintances.
It's unclear what sparked the argument.
Dennis is expected to be arraigned on manslaughter charges.