A Greek oil executive, whose company filed for bankruptcy last month, killed himself at his home in an Athens suburb on Sunday, according to a medical examiner’s report.

The 84-year-old Kyriakos Mamidakis, 84, was chairman of the board of Mamidoil-Jetoil, an oil company that is active and operates about 600 gas stations in Greece alone, a fleet of 33 tanker trucks and seven ships for supplying islands and vessels and owns the largest single storage site in the Balkans. It also operates in neighboring countries including Bulgaria and Albania and is the largest privately-held Greek company, according to Jetoil’s website.

Although police were still investigating his death, they said they have found no signs of foul play deeming it a suicide.

Oil products retailer Jetoil requested court protection from creditors as it was unable to make payments on its debt, financial website capital.gr reported July 1.

Mamidoil-Jetoil filed for bankruptcy on June 9, Kathimerini reports, declaring that it owed creditors 314 million euros ($350 million) at the end of 2015, while having cash reserves of 600,000 ($668,000).

Mamidakis was also involved in hotel management, shipping, and olive oil and wine production.