A keen golfer, 65-year-old Tappin was enjoying his retirement and role as president of the Kent County Golf Union, which represents the county's 95 clubs.
His passion for golf is something he shares with son Neil, who is deputy editor of Golf Monthly magazine.
But a US sting operation that led to Tappin being accused of selling batteries for surface-to-air missiles to Iran shattered the Tappin family's apparently idyllic lives.
After a two-year legal battle, the retired businessman was extradited to Texas to stand trial.
The grandfather is said to have kept himself sane by practising golf, using his walking stick as a club and rolled-up tissues as a ball.
Tappin was given a reprieve from the windowless walls when he was released on bail in April.
More top news
People should only be allowed to move freely within the EU if they have a job waiting for them, the Home Secretary has said.
A 62-year-old woman has been found alive more than a week after she vanished while on a hiking trip.
The first African American actor to play the lead role in Les Misérables on Broadway has died, aged 21.