GTCR has announced it will acquire GreatCall.

GTCR, founded in 1980 and based in Chicago, is a PE firm that invests in a number of sectors, including healthcare. Since its inception, GTCR has invested more than $12 billion in over 200 companies.

GreatCall, headquartered in San Diego, is a provider of connected health and personal emergency response services for active aging.

The transaction is expected to close in the third quarter of 2017. Terms were not disclosed.