I would think MD would be the same. The sniper doesn't work weekends or holidays.
I bet the bastid could be a postal worker... a foot-walker who has a truck. Walks the neighborhood and knows the terrain.
He/she carries a bag without much mail and the rifle is in 2 or 3 parts.
Road noise muffles the shot and when the victim drops, he/she is back on the job in 2 minutes.