Theo Albrecht, the billionaire co-founder of budget supermarket empire Aldi, last seen in public after his release from kidnap nearly 40 years ago, has died aged 88, the firm said on Wednesday.
The publicity-shy joint creator of an international supermarket chain with estimated annual sales of 50 billion euros ($A72.08 billion), died on Saturday in the western German city of Essen, Aldi said, after a long illness.
Albrecht was the second wealthiest man in Germany, after his equally reclusive borther Karl. Forbes magazine described the pair as "more elusive than the Yeti".
"Aldi mourns a person who was always decent with his business partners and employees and always treated them with respect," the company said. "We are losing in him our highly respected founder and a upright person."
According to Manager Magazin's latest rich list, the Albrecht brothers were the two wealthiest people in Germany, with Karl amassing a fortune of 17.35 billion euros ($A25.06 billion) and Theo 16.75 billion euros ($A24.16 billion).
But almost nothing is known about the two, with Theo's last public appearance dating from 1971, the year he was kidnapped for 17 days and then released for a ransom of seven million deutschmarks (about three million dollars).
His kidnapper reportedly demanded he show his identity papers, unable to believe the normal-looking man in simple clothes was in fact the billionaire he aimed to abduct.
One of the rare photos of Theo in existence, from the 1980s, shows a nondescript-looking man with grey hair and glasses. Shunning the limelight, he is rumoured to have preferred collecting old typewriters, orchids and golf. He reportedly had his own private golf course.
He is survived by his brother and by children, but as with his other biographical details, it is unclear how many.
The two brothers owed their wealth to their pile-it-high, sell-it-cheap Aldi chain, short for "Albrecht-Discount", that sprouted up all over Germany and is now in nearly 20 countries after first appearing in the 1960s.
According to company legend, Karl and Theo were born into a modest family, and their mother opened a small shop when their father, a miner, became too ill to work.
Upon their return from World War II, the pair built up their empire from this one shop.
At the end of the 70s, they branched out abroad, investing in US retail chain Trader Joe's, with 350 stores specialising in organic and fair-trade foods.
They had previously carved up their German operations between them, with Theo running the business in the north, his brother in the south.
Weakened by illness, Theo long ago handed over the reins of the operations but he reportedly continued to go into the office on a daily basis until a very advanced age.
According to an old Sueddeutsche Zeitung daily profile, he "always turns out the light behind him, insists that colleagues write on both sides of a piece of paper and always checks where the emergency exits are in hotels".
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