Jonathan Kinsley, 59, and his brother Timothy, 57, both of Pennsylvania, were killed Monday in an avalanche while heli-skiing in southeastern British Columbia. A third man, a skiiing guide, was hospitalized after the incident and is expected to survive. The avalanche happened in the area of Mount McCrea near Revelstoke. The brothers, based in York, were leaders at two prominent, affiliated real estate and construction firms operating primarily in Pennsylvania and Maryland. British Columbia is in the midst of its most dangerous avalanche season in decades.