His coverage of the 1969 Argentine student/labor uprising known as the Cordobazo (whose first serious incidents erupted on his 29th birthday) brought Henrichsen to the attention of Swedish Public Television (SVT), and he was hired later in 1969.
Working with chief correspondent Jan Sandquist, his first assignment there was during a massive, October 1972 truckers' strike in protest over the program of nationalization being advanced by Chile's Socialist President, Salvador Allende.
On the morning of June 29, 1973, the day of the attempted military coup known as the Tanquetazo, as Henrichsen had breakfast at the café in the Hotel Crillón (across La Moneda Presidential Palace in downtown Santiago), the sound of gunfire erupted outside, leading him and Sandquist to rush to cover the event.
As he began filming, a detachment in a mutineering Chilean Army regiment attempting to storm La Moneda, attacked protesters and bystanders nearby and, noticing him and his camera, the ranking officer, Corporal Héctor Bustamante Gómez shot his pistol at Henrichsen, prompting his men to fire, as well.
Promoted to a high-ranking post within Chile's intelligence services (DINA) following the September 11, 1973, coup against Allende, Souper continues to enjoy impunity and Corporal Bustamante had no charges brought against him until his role in the murder was confirmed by Chilean documentarian Ernesto Carmona in January 2005, following his 7-year-long investigation.