Short answer. Yes, but usually piece by piece. If the buyer has died leaving several heirs, you can generally press the redemption against each heir only for his own share. The exception is where the estate has been divided and this particular property was awarded to one heir, who then answers for the whole.
What the law says
If the vendee should leave several heirs, the action for redemption cannot be brought against each of them except for his own share, whether the thing be undivided, or it has been partitioned among them.
Civil Code, Article 1615 — Redemption Against a Vendee's Heirs. Read the full provision →
The default rule: share by share
Article 1615 of the Civil Code covers the awkward case where the person you sold to under a right of repurchase dies before you exercise it. The right does not die with him — his heirs step into his place. What the article limits is how you press it. If the vendee should leave several heirs, the action for redemption cannot be brought against each of them except for his own share, and this holds whether the thing be undivided, or it has been partitioned among them. In practice you bring the heirs in together, each answering for the portion he inherited, rather than picking one and demanding the entire property back from him alone.
The exception: when one heir received the property
The second sentence gives the cleaner case. But if the inheritance has been divided, and the thing sold has been awarded to one of the heirs, the action for redemption may be instituted against him for the whole. Where the estate has actually been settled and this particular property landed in one heir's hands, he holds all of it and he answers for all of it. Note what the distinction really turns on: not whether a partition happened in a general sense, but where this property ended up. So the first thing to establish is whether the estate was settled and what the settlement says about this land.
What redemption still requires of you
The article governs whom you sue, not whether you succeed. Everything else about a right to repurchase must still be in order. The right must genuinely have been reserved in the sale itself, and it must be exercised within the period the law allows — those periods are short, and once they lapse the buyer's ownership becomes absolute. You must also be ready to return the price and the other amounts a redeeming seller is required to reimburse. Arriving with a demand and no money is not exercising the right; it is announcing an intention to.
Where these claims go wrong
Two things commonly derail them. The first is delay. Heirs often do not know the property carries a right of repurchase; they mortgage it, or sell it on, while the redemption period quietly runs out. The second is paperwork. You will need the deed showing the right was reserved, proof of the buyer's death, and whatever extrajudicial settlement or court order divided the estate — that document decides whether you face several heirs for fractions or one heir for everything. If the property has since passed to an outside buyer, the position becomes considerably harder and is worth taking advice on without delay.