Family and friends gathered today to say goodbye to the man who died in Friday's construction crane collapse in Tribeca. The massive structure laid on Worth Street until Sunday morning. NY1's Bree Driscoll brings us this update.

The funeral for 38-year-old David Wichs was held Sunday morning on the Upper East Side.

Wichs died when the crane fell onto Worth Street.

The area was still blocked off Sunday morning but the crumpled steel from the 565-foot-long crane is now gone. The investigation, however, is just beginning.

"The investigation could take weeks," said Office of Emergency Management Commissioner Joseph Esposito. "We have had investigations that go on for months in these types of situations. So you have to be patient as far as really looking at what the cause of this was."

The first step of this investigation was dismantling the 565-foot boom of the crane that has now been reduced to a massive heap of twisted and broken metal.

It was broken into 35 separate pieces and taken out on flatbed trucks to be examined further.  

"The main point is to cut them in locations that doesn't compromise the forensic engineering value so we can have experts study how these pieces failed," said Department of Buildings Commissioner Rick Chandler.

That failure caused the massive structure to collapse across two blocks on Worth Street around 8:30 Friday morning — killing 38-year-old David Wichs and injuring three others. 

Investigators from the Department of Buildings and an outside contractor will also be looking at the crane's computer for clues.

"It will likely give us the angles of the boom, of the two pieces that were in action at the time," said DOB Commissioner Chandler. 

What investigators have ruled out is the crane's operator being under the influence.  

"He has been very cooporerative and he has tested negative for all substances," said OEM Commissioner Esposito.

While crews are working to restore some sense of normalcy here on Worth Street residents are still uneasy after what happened in their neighborhood.

"I saw the crane two days ago and I said that didn't look safe at all and literally it came down the next morning," said one resident.

"It is definitely concerning that something like this would happen," said another. "I am assuming more measures will be taken going forward to make sure that doesn't happen again."

That is exactly what the Department of Buildings is working on.

"This is one of the largest boom lengths that has been erected in some time," Chandler said. "So we are going to investigate whether there might be an adjustment to how operations are done based on the size of the crane."

After issuing a stop-work order the DOB has given the ok for cranes around the city to resume operations, some after an additional inspection.