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The robbery in Queens that led to the death of a police detective last week was a two-man operation — synchronized, preplanned and the duo’s second in a week, according to the police.

One man was a lookout on Tuesday who hovered outside the Richmond Hill cellphone store, scanning for trouble.

The other was the muscle. He carried a realistic-looking toy gun and a duffel bag as he forced employees to open a cash register and two safes at the back of the T-Mobile store on the corner of Atlantic Avenue and 120th Street, according to a criminal complaint filed Sunday.

If everything went to plan, the pair had discussed in text messages how they intended to divvy up the spoils.