A late-night snowmobile romp by a group of friends ended in tragedy in a pile up on a frozen upstate lake over the weekend, killing a 22-year-old Genesee County man, state police said.

“Along came a gentleman called Alec Ullman, a Russian American engineer, who had a liking to sports-car racing, particularly Le Mans.” Ullman turned the runways, taxiways and access roads into ...