Mack Trucks and the United Auto Workers Union are set to return to the negotiating table Oct. 23, seeking to end a heightened impasse over a new five-year labor agreement.

Negotiations were scheduled to resume between UPS Inc. and the International Brotherhood of Teamsters after they reached a tentative five-year labor agreement last month covering 250,000 drivers, loaders, package sorters, dockworkers and operations team members.

Contract negotiations between UPS Inc. and the Teamsters Union began in January with the union and the package delivery firm taking a measured approach to reaching a deal before the July 31 deadline.

Teamsters President James Hoffa has fired Sean O’Brien as the top negotiator on behalf of UPS Inc. and its UPS Freight employees after only six months, prompting the ousted director to write a blistering rebuke to the union leader.

The son of one of the UPS drivers who was killed in last month’s shooting at a San Francisco distribution center said he still feels like he’s in a dream sometimes and he’ll wake up and see his dad.