Do you hold any suggestions on parakeets and extermination of a mate?

Ok today after almost 4 years (birthday would have be 21st) and having been playing just fine and interacting and ingestion as usual my beloved female parakeet died unexpectedly..The deal is it appears she may have a broken collar but also may have fallen from a perch and hit her head...It be not caused by her brother and mate (no they did not ever lay eggs together) and he is very very appalling...The blinds were closed and the only thing I can numeral is she may of been startled but I cant figure out how.Nothing seems to be inappropriate except that she is gone...Also he has been chirping massively lowly and rubbing his head and beak at the area of the cage where on earth she was found.Is this normal and should I be worried he will die from a broken heart? She was born sometime before him and they were my world...I know I must go and allow him to treat as well as continue to allow him in interact beside his doggy brother and cockatoo brother as well...Any suggestions?
I am soo sorry. My daughter and I and our keets just lost one, a male. I thought maybe one of the others could hold attacked him, that maybe he starved himself &/or was too stressed from moving to a different room, or that he broke his neck. His eyes looked unambiguous when we found him on the floor of the cage, and it is possible he could've fallen too. I don't recall his beak self open like he was struggling for breath, so I suspect he did not enjoy anything contagious. We also found a lot of feathers all over which is where we reason the fighting or broken neck part may enjoy come in. We think he might have gotten his lead stuck and panicked and we hope that our other male did not deliver a fatal blow to him. He could own played with a toy and got his claw stuck and panicked. The panic could have explained the screaming (loud angry parakeet sound). By the time I got there, I did not interest anything out of place either, and he seemed fine and he be hungrily eating. I did notice him on the floor the night after that, but he get off the floor and seemed normal next. He also seemed to be trying to hide I think possibly from the other birds? If you check out some of my more recent question, it may help to know you're not the only one who's going through this and help shed some table lamp on this too and it may give you more detail. What I understand is to pay much more attention to the one you hold now. It is possible for one to die of a broken heart and he needs to know he is not alone. He could even be just really lonely, bored or stressed from the loss and the thought it could evolve to him (he might not know what but he knows she's not there any more). I've been considering getting one of the females (the widowed feminine, the potential mate) who seemed like she had bonded near him and seemed really sad and lonely and left out of the other keets lives, her own fresh potential mate. You might want to wait at least a week or 2 before you opt and focus on your healing and your keets healing as I know you feel desperate and probably the mate too. If you do decide to get another, put it in quarrantine to be secure, in case it has something, or contained by case your female keet may have have something that she hid very well and to see whether any other the other keets go through this (none of my others have passed which also tells me it must not hold been something contagious but rather something emotionally and/or physically traumatic). Also I know it sounds morbid, but you could have her body autopsied, a short time ago for peace of mind of knowing, and the vet may be able to reassure you as the keets' person and endow with you his or her medical advice on whether you should try to find a feathered friend for the widower mate or if your extra nearly undivided attention will be a better choice. Sometimes parakeets can have tumors or inner organ problems, and an autopsy may help determine if it be something like that. My daughter and I at the count of 3 with out highest pitched voice tell our widowed female "Your such a pretty bird, <name>". We know she's a female who might not ever repeat that phrase, and she is beside the others in the cage, but it really looks like she listen, and it really looks like to both of us like she is smiling; she closes her eyes with a pleased look to her, and we estimate she is soo cute when she does that. Maybe you can come up with a phrase that you say to yours so that he will know it is something that just the two of you share. And you could even become one of his best friends whether he gets that close to you and opens up after this. Just take it smooth and play it by ear.
Get another bird. They'll bond quickly.
Answers:    I would get another budgie. Sometimes they can have funny turns when here best mate dies i would recommend you buy another parakeet just in case he go strange.
I think your budgie fell of her perch and hit her head in the wrong spot and cause her death.
So sorry to here that happen
draw from it another bird
REPLACE THE BIRD.
My up to date budgie wont sleep on any perch, he cling to the wall?   My pigeons maintain dying why ?   Would a impersonator bite effect an infection?   A devout student bird.?