Investigators say a plane crash in San Diego that likely killed six people happened as the private plane approached an airport whose runway lights were out in heavy fog.

Tributes were pouring in across social media Thursday for music agent Dave Shapiro and drummer Daniel Williams, who were both believed to be involved in the deadly plane crash in a Murphy Canyon neighborhood.

The men were among several killed in a May 22 plane crash near San Diego. Both were at Pierce the Veil's sold-out MSG show. Here's what to know.