The 31-year-old Haryana para-athlete was leading initially in the six-round competition with a best throw of 26.63m -- which he came up in his second attempt -- before eventually losing his way later to fall out of medal bracket and finish fourth.
2012 London Paralympics gold winner Zeljko Dimitruevic of Serbia took the top spot with a world record throw of 29.91m, while Milos Mitic (26.84m), also of Serbia, and Marian Kureja (26.82m) of Slovakia bagged the silver and bronze respectively.
Amit had won a gold in the 2014 Para Asian Games in Incheon and a silver in the 2015 IPC World Athletics Championships.
A road accident at the age of 22 left him with severe spinal injuries, tragically making him a quadriplegic confined to a wheelchair.
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India has won four medals in the Rio Paralympics (2 gold, 1 silver and 1 bronze). Mariyappan Thangavelu (men's T42 high jump) and Devendra Jhajharia (men's F46 javelin throw) had won gold medals in their respective events while Deepa Malik (women's F53 shot put) and Varun Singh Bhati (men's T42 high jump) had bagged a silver and bronze respectively.
India are being represented by 12 para-athletes in the Rio Games.
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