Formerly a secular artist, Size 8 is known for her singles “Shamba Boy” and “Moto”. In April 2013, she released her first gospel single “Mateke”. As an actress, she had a small role in the legal comedy Mashtaka.
She was raised in Maringo Estate in Nairobi. She is the sixth born of six other siblings to Samuel Kirui Munyali, a Ugandan and Esther Njeri, a Kenyan, both members of the clergy. She attended Dr. Livingstone Primary School where she topped in her class in the KCPE. In her high school, she got a scholarship in State House Girls.
Munyali was discovered by Clemo, a Kenyan producer and co-founder of Calif Records, when she auditioned locally and later signed on the Record label. She released “Shamba Boy”, “Silali” and “Vidonge”. As of April 2013, she confirmed to have crossed over to the gospel music industry, having been born again, and subsequently releasing her first single “Mateke”. She has released others like “Moto”, “Yuko na Wewe”, “Jemedari” and “Afadhali Yesu”
Size 8 got married to Samwel Muraya, commonly known as DJ Mo, a disc jockey in September 2013. Together they have a daughter Ladasha Belle Muraya, born on 19 November 2015. A day after which her mum passed away of Kidney failure.
In 2014,”Mateke” got nominated for best video of the year, and she won.
Shelost the other categories that she had been nominated; Female Artist of the Year “Herself” and song of the year “Mateke”