WATERBURY, Conn. (AP) — Jonathan F. Kellogg, a former Associated Press bureau chief who served as executive editor of Connecticut's Republican-American newspaper, has died. He was 68.

Kellogg died Monday at his home in Harwinton. His brother-in-law, Bill Mitman, said he died unexpectedly and the cause was undetermined.

Kellogg became executive editor of the Waterbury newspaper in 1997, and he retired in June. He also had served as executive editor of The Sun in Lowell, Massachusetts, and managing editor for the Portland Press Herald in Maine and the Maine Sunday Telegram.

"We mourn the loss of our colleague and friend, and we extend our sympathy to his wife, Tammalene, and his family," Republican-American Publisher William J. Pape II said in his newspaper.

Tammalene Mitman thanked her husband's former staff, colleagues and friends in the community for their support, but asked for privacy in an unexpected time of grief, the newspaper said.

"He cared very much about his staff, and about the newspaper," she told the Republican-American. "They should know that his concern and hopes for them were sincere. He wanted very much for them to be successful."

Kellogg spent 16 years with the AP, including 10 years as bureau chief for Maine, New Hampshire and Vermont.

He was a member of The New England Newspaper & Press Association's Hall of Fame and was recognized with the Yankee Quill award for his contributions to journalism in the region.

Kellogg was born in Waltham, Massachusetts, and graduated from the University of New Hampshire.

Funeral arrangements were pending.