Why did my crimson bellied conure die?

by Lori

I had a crimson bellied conure for maybe two weeks before he died. I fed him 1/4 cup pellets everyday that he would chow down happily with fresh water as well as fruits and vegetables. He was very rambunctious and loved being held. He also loved to dance and peep at you. One morning I woke up to him peeping and whistling. I went and fed him his food and he ate it right away. When I went to check on him he was on the floor of his cage blinking and breathing slowly. Then he died.

I took him to the place where I bought him and they said he was thin and possibly starved. But that couldn't be right! He always ate all his food and I fed him the amount the vet told me to.
As an additional detail I noticed he would get a lump in the side of his neck that felt real solid and out of place which I thought maybe is normal for birds after they eat. He was only just recently put on solid food. I did not hand feed him the people at the aviary did and said he was ready to be on a solid diet.