[2] Upon his return from London, he became a volunteer at the Sepilok Orang Utan Rehabilitation Centre in Sandakan, Sabah.

[4] In 2011, Tunku Abdul Jalil entered 9-months Royal Malaysia Police (RMP) Probationary Inspector Course Intake 1/2011 at Malaysian Police Training Centre (PULAPOL), Semarak Road and commissioned as Probationary Inspector on 8 January 2012.

[7] Tunku Abdul Jalil was confirmed to have stage four liver cancer in December 2014 and had sought treatment at a hospital in Guangzhou, China.

[3] Tunku Abdul Jalil died on 5 December 2015 in Royal Ward, Sultanah Aminah Hospital, Johor Bahru at the age of 25 due to cancer.

[3] On 6 December 2015, he was accorded a royal state funeral in Istana Besar, Johor Bahru and was buried next to the grave of his late grandfather, Almarhum Sultan Iskandar ibni Almarhum Sultan Ismail at the Mahmoodiah Royal Mausoleum, Johor Bahru.