[2] He was the second runner to be murdered that month, alongside fellow bronze medalist Agnes Tirop.

He won the 100 m and 200m at the 2012 Ibero-American Championships in Athletics, with his 20.34s national record in the 200 m qualifying him for the 2012 Summer Olympics.

He ran a new Ecuadorian national record of 20.28 s in the heats of the 200 metres at the 2012 Olympics and qualified for the final, where he finished seventh.

[2] Quiñónez won the bronze medal at the 2019 World Championships in the 200 metres event.

He qualified to represent Ecuador at the 2020 Summer Olympics in the 200m in Tokyo but was provisionally suspended for "whereabouts failures" less than a month before the games began.