A 28-year-old North Long Beach man was killed Wednesday when he fell from a roof and struck his head while working at a San Diego commercial property.

Salvador Montano, a construction worker, died instantly when he fell 30 feet down a mechanical well to the ground at a work site at 6925 Lusk Blvd., according to the San Diego County Coroner.

Relatives described Montano as a hard-working family man. He left behind a wife and three young daughters.

A GoFundMe page has been created to help pay for funeral expenses.

His death is being investigated by the Occupational Safety and Health Administration.

The nature of the work on the property is unclear. The building at the site was vacant last summer when it was sold to HCP Inc., a real estate company focusing on health care and life-science properties.

HCP planned to convert the building for use in research and development as well as office and laboratory elements, according to the San Diego Business Journal.