Suthep enjoyed a period of great popularity, during which he made many recordings and sang live for films, television, and stage productions. However, he soon reached the age of conscription in 1955. He joined the
Royal Thai Air Force, and was assigned to the Music Division, with the rank of leading aircraftman. He served his two years of conscription mostly as a singer for the Air Force's military band, and was chosen as part of a cultural exchange delegation to the People's Republic of China in 1957. However, when
Sarit Thanarat took power
by coup shortly after their return, the delegates became accused of being Communist supporters, and Suthep had to flee to Japan, where he attended the
Tokyo University of the Arts for three years before being allowed to return and resume his singing career. In 1967, Suthep began writing as a columnist, first about the country's music scene for
Fah Muang Thai magazine, then expanding in 1970 to write about politics for
Thairath,
Ban Muang,
Siam Rath, and several other newspapers. When the
14 October 1973 uprising toppled the military government, he joined the
New Force Party and stood for election in Bangkok's
Phaya Thai District and later in his hometown, but failed to be elected both times. Following the suspension of parliament during the military government of 1976, he again stood for election
in 1979, and was elected to the House of Representatives, representing Nakhon Ratchasima. He failed to be re-elected
in 1983, but joined the
Palang Dharma Party and successfully stood for election
in 1988, representing Bangkok until the
1991 coup, after which he retired from politics. In his personal life, Suthep married Pussadee (née Anakkhamontree) in 1967. They had one son, Ritthikrai. Suthep remained active into his 80s, when his health deteriorated. He had a stroke in early 2019, and was admitted to
Siriraj Hospital for over a month due to a blood infection. He died at home in Bangkok on 27 February 2020, aged 85. ==Works and recognition==