He is married to Mary, daughter of former Kerry footballer John Dowling, who is a teacher of history and economics in Mercy Secondary School, Mounthawk.
By the late 1960s, Deenihan was a key part of Kerry's inter-county set-up and was playing on the county's minor team.
Two years later in 1975, Deenihan captured his first Munster Championship and All-Ireland medals at senior level, under the new management of the legendary Mick O'Dwyer.
It was the beginning of a glorious era for Kerry football and Deenihan played a key role in orchestrating much of the success.
In 1976, Deenihan won his second Munster title, however, Dublin gained revenge for the previous year by defeating Kerry in the All-Ireland final.
1977 was another frustrating year as Kerry won another set of National league and Munster titles but lost out to Dublin yet again, this time in the All-Ireland semi-final.
The game itself is remembered for Mikey Sheehy's cheeky goal which he scored by lobbing the ball over the head of Paddy Cullen.
It was a very special year as he collected his seventh consecutive Munster Championship medal before later leading Kerry out in a fourth All-Ireland final appearance.
On the day the men from 'the Kingdom' easily defeated Offaly to give Deenihan his fifth All-Ireland medal.
Deenihan's last appearance in a Kerry jersey was in May 1983 when he played a challenge game at the opening of the Tarbert GAA field.
[9][2] In May 2011, he set out proposals to acquire from the Bank of Ireland the old Irish Parliament building in College Green for the state, to use as a cultural venue.
[11] He was reported by the Irish Examiner as having announced the awarding of the title of City of Culture 2014 to Limerick in June 2012 without indicating the criteria for selection.